We don't know whether or not Castiel (Misha Collins), Crowley (Mark A Sheppard), Lucifer (Mark Pellegrino), or any of the other Supernatural characters will be showing up – or whether or not we'll be seeing Shaggy, Daphne, Fred, Velma or Shaggy for that matter, either.

But the idea is brilliantly bizarre, and we can't wait to see how the episode goes down.